Snail Shells Adsorbent for Copper Removal from Aqueous Solutions and the Production of Valuable Compounds

Table 1

Parameters and correlation coefficients obtained from the analysis of adsorption kinetics by pseudo-first-order model, pseudo-second-order model, and Elovich equation.

Kinetic model	Parameter
Pseudo-first-order	k1 (min^−1)	qe,cal (mg·g^−1)	qe,exp (mg·g^−1)	R^2
	0.066	15.064	12.193	0.896	0.884
Pseudo-second-order	k2 (g·mg^−1·min^−1)	qe,cal (mg·g^−1)	qe,exp (mg·g^−1)	R^2
	0.004	14.075	12.193	0.979	0.977
Elovich	β (mg·g^−1)		α (mg·g^−1·min^−1)	R^2
	0.317		1.605	0.879	0.868